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Each element used in the workflow must be described inside the body.An element description consists of the element name and a set of parameters enclosed in curly braces. A parameter and the value are separated by ‘:’, different parameters are separated by ‘;’:

element_name {


See, for example, a description of the Read alignment element:

read-msa {
    name:"Read alignment";

Note, that the values of the parameters for an element can also be presented in the iterations block.For all elements the following parameters are defined:

    • type - specifies the type of the element.
    • name - specifies the name of the element. It corresponds to the element’s name in the GUI
    • .validator - validates the element by the input validator type's parameters:
      • type - specifies the type of the validator.

For example this validator validate that the read sequence element has two or three datasets:

    read-sequence {
        name:"Read Sequence";
        .validator {

For custom elements there is special parameter:

    • script - sets the script text of the element, for example:
dump-info {
    type:"Script-Dump sequence info"
    name:"Dump sequence info"
    script {
        out_text=getName(in_sequence) + ": " + size(in_sequence);

The list of parameters available depend on an element. Refer to the Workflow Elements chapter to find out the parameters for a particular element.To set a script value for a parameter use the following form:

parameter_name {
    a script value
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